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SOURCE: How do I change the battery of a Jules Jurgensen pocket watch.
First you have to get an eyeglass and examine watch caseback. Can you see the joint or is it monoblock? If there is joint, get strong knife and press into it. Some of watch casebacks are very tight, so, apply great pressure but do not let the blade slip or you will damage the movement.
If the case is monoblock, then you have to open it from dial side.
Be very carefull when doing it as any slip of the blade will damage your watch.
Good luck.
SOURCE: Watch Instruction manual
The best thing to do for instructions for a Jules Jurgenssen is to contact them. You may also try retailers who carry their product.
Jules Jurgensen Helbrose International
101 West City Avenue
Bala Cynwyd, PA 19004
USA
Corporate Phone: 
1-800-220-1233
SOURCE: Needs battery replacement
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Here's my suggestion. Take it to the jewelry dept at
Walmart. Do you have one where you live.
They'll replace for free - Battery $8
Watch how they do it with their tools and you'll know how to do it yourself in
the future.
Good luck
SOURCE: Looking to adjust the size
For removing or adding links firstly you will have to remove bracelet pins or screws. In case if there are screw on each side of bracelet - you have to use two screwdrivers simultaneously. In case if there are pins - read the rest:
You may or may not have arrows inside bracelet. Arrows are pointing the way the pins must come out. First you have to find out what sort of pins or even screws are used to keep links together (screw ends and pin end may look similar). Examine both bracelet sides and find the side where pin ends have a groove. Start with a tiny screwdriver and try to unscrew one. If it turns, but doesn't come out, that means you have a pins instead of screws. For removing pins the best would be pin removing tool (approx.5GBP on ebay), but it's possible to do the job without it. Take a hardened steel needle and blunt the sharp end to the approx. size of pin end diameter using any sharpening stone or sandpaper. Get an old towel and fold it to make a soft base for work (like small cusion). As you don't have a special bracelet holder you will need a pair of helping hands to hold the bracelet steady upright. You will need small hammer and pair of flat nose pliers as well. NOTE: The pins MUST be driven split end out first, not vice versa. Make sure that the grooved pin ends are facing towel, not the needle and hammer. Now place the watch on the folded towel, take that needle and smallest hammer you have and start driving the pin out using light blows. Do Not hit hard, as you will brake the needle, scratch your watch or even injure yourself. Watchmakers are using 45 gram hammer, so, calculate your strength of blows. After a few punches check if the split end is coming out and when you see that the pin end is coming out long enough - grab it with pliers and pull the pin out with pliers. When pulling, do NOT turn pliers, as pins tend to brake when twisted. Use firm grip and your strength to pull the pin without twisting. After shortening the bracelet or adding extra link(s) make sure that the pins go back EXACTLY the same way as they came out- the blunt end first in the hole and the split (grooved) end last. Before doing that check remaining pins in bracelet to make sure that you put them back from the right side of bracelet. It is recommended to use plastic hammer to drive pins back in or you will scratch or damage bracelet. If plastic hammer is not available use an old toothbrush handle (or some plastic item) as an absorber. Simply put pin into the hole as deep as you can with your fingers, put the toothbrush handle on split pin end and hit handle, not the pin. Make sure that pin ends are flush with bracelet. If needed- hit few more times. Job done! If you do not want to do it yourself, any jeweler will do it in a matter of few minutes.
1-800-220-1233
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